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Vanderbilt Pathology Laboratory Services

Test Directory



CORTISOL (COR)

Department: Chemistry
Test Synonym(s): COR
CPT Codes: 82533
Methodology: Competitive Binding Immunoenzymatic Assay
Reference Range: Specimens collected before 10AM: 3.7-19.4mcg/dL; Specimens collected after 5 PM: 2.9-17.3
Tube Type: Light green PST (Lithium Heparin with gel) tube - 4.5 mL
Specimen: Plasma
Pediatric Requirements: 1 light green top microtainer
Volume: 1 mL plasma
Minimum Volume: 0.3 mL plasma
Temperature: Centrifuge immediately and store at 2-8 degrees C.
Stability: Refrigerated (2 - 8 C) : up to 14 days Frozen (-20 C) : 30 days Avoid multiple freeze/thaw cycles
Reasons for Rejection: Hemolysis; improper collection
Days Performed: Daily
Times Performed: Continuous
TAT: STAT: 1 hour; ROUTINE: 2 hours after receiving in lab
Significance: The Endocrine Society suggests a cut off of < 1.8 mcg/dL 8 hours after 1 mg Overnight Dexamethasone Suppression test or 2 hours after the last dose in the Longer Low dose Dexamethasone Suppression Test.

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